I would firstly ignore the first post above. Think about how much you want to do medicine, to be honest from your post you don't seem overly committed, but it's not exactly something that's easy to judge from one post on a forum - and I don't know you.
Basically thoses GCSE results will severly limit your choices of med school which you meet the minimum requirement, though there are a few, and with decent A level results you stand a fighting chance.
However, competition is fierce, and so you will need to make up for your
relatively low passes with extra-curricular activities, work experience and enthusiasm for medicine. I would also help to interview well! With a good PS, reference from your school/college and predicted grades there is no reason why you should be put off applying.
Without wanting to put a downer on it, how would you feel about resitting some subjects (namely maths, science and english) to attempt to boost your grades. Some unis aren't overly happy with this, but if you ask individual admissions teams, and emphasise that you are doing it because of your desire to do medicine, they may be able to advise.
Medicine isn't an academically tough course, but it can be a slog, and getting your foot in the door can take some real hard graft - but if you are prepared to put in the effort there is no reason why you should be disheartened yet
Also, there is always the graduate entry, pre-med or access to med courses which would perhaps suit your situation. Though as I stated initially, it all depends on your commitment to medicine
edit: SEE SIG for lots of handy info